bin: safer console password input
bin: safer console password input

Allow reading the console password from a variable or interactively.

Change-Id: I9b672e30d5cd834778e228794e13c7aa0dd1c6ab
Bug-Url: https://bugzilla.redhat.com/1021902
Signed-off-by: Yedidyah Bar David <e7f2f616ce8817ad893bbeaad3e942e94c69d323@redhat.com>

oVirt/ovirt-hosted-engine-setup,oVirt/ovirt-hosted-engine-setup